anti-
an·ti-
/ˌænˌtaı, ˌænti; sometimes ˌæntı before consonants/ prefix
1 : opposite to something
anticlimax
antisocial
2 : against someone or something
antigovernment [=opposed to the government]
antismoking
antiwar
— often used with a hyphen
anti-American
anti-poverty
anti-gun
opposite pro-
3 : acting to prevent something
antibacterial
antifreeze
antitheft
4 : fighting or defending against something
antiaircraft